I have these four circles that are moving from the bottom of the screen to the top. I have another circle in the middle of the screen. The circle in the middle can move to the left and right by touching either the left or right side of the screen. I want the score to increment by one every time the circle in the middle of the screen dodges one of the other 4 circles that are coming up. How would I accomplish this? Thanks. This is the code I have that is not working for what I want it to do.
// This function is called on contact between physics objects
func didBeginContact(contact:SKPhysicsContact){
let node1:SKNode = contact.bodyB.node!
let node2:SKNode = contact.bodyB.node!
if primaryBall == contact.bodyA.node! {
primaryBall.physicsBody?.affectedByGravity = true
view?.scene?.paused = false
} else {
primaryBall.physicsBody?.affectedByGravity = false
}
if ballToDodge.size.height > -50 + primaryBall.size.height {
self.score++
highscoreLabel.text = String(score)
}
}
override func update(currentTime: CFTimeInterval) {
if ballToDodge.position.y < enemy.position.y {
self.score++
highscoreLabel.text = String(score)
}
}
Related
I'm trying to animate something that spins / left to right, but whenever I call
spinLeft() or spinRight() then the animation always starts from frame 0.
In other words, I want to be able to say spin something 4 out of 10 frames, stop, then
spin in the opposite direction, FROM frame 4. Right now, it resets to frame 0.
var textures = [SKTexture]() // Loaded with 10 images later on.
var sprite = SKSpriteNode()
func spinLeft() {
let action = SKAction.repeatForever(.animate(with: textures, timePerFrame: 0.1))
sprite.run(action)
}
func spinRight() {
let action = SKAction.repeatForever(.animate(with: textures, timePerFrame: 0.1)).reversed()
sprite.run(action)
}
You could do this (Syntax may be a little off, but you get the point):
The key here is the .index(of: ... ) which will get you the index.
func spinUp() {
let index = textures.index(of: sprite.texture)
if index == textures.count - 1 {
sprite.texture = textures[0]
}
else {
sprite.texture = textures[index + 1]
}
}
func spinDown() {
let index = textures.index(of: sprite.texture)
if index == 0 {
sprite.texture = textures[textures.count - 1]
}
else {
sprite.texture = textures[index - 1]
}
}
func changeImage(_ isUp: Bool, _ amountOfTime: CGFloat) {
let wait = SKAction.wait(duration: amountOfTime)
if isUp {
run(wait) {
self.imageUp()
}
}
else {
run(wait) {
self.imageDown()
}
}
}
If you use something like a swipe gesture recognizer, you can use it's direction to set the isUp Bool value and the velocity of that swipe for the amountOfTime for the changeImage function.
The changeImage will only change the image once, so you will need to handle this somewhere else, or create another function if you want it to continuously spin or die off eventually.
Hope this helps!
Code:
func jumpAction(_ JumpPos: CGPoint, _ clickPos: CGPoint) {
if jumpCount < 2 {
var disty = (clickPos.y - JumpPos.y)
var distx = clickPos.x
self.physicsBody?.velocity = CGVector(dx: 0, dy: 0)
self.physicsBody?.applyImpulse(CGVector(dx: distx, dy: disty))
if onGround == false {
jumpCount += 1
}
}
}//
func didBegin(_ other: SKSpriteNode, _ contact: SKPhysicsContact) {
if contact.contactPoint.y < self.frame.minY + 10 {
jumpCount = 1
onGround = true
}
if other.physicsBody?.categoryBitMask == Mask.SpinPlat {
jumpCount = 0
}
}
func didEnd(_ contact: SKPhysicsContact) {
onGround = false
}
I have 3 functions above. The JumpAction is called when I press on the Jump Button on the screen. The didBegin and didEnd functions are called when contact with the top of a platform occurs with the player.
My issue:
So if player is on platform and I jump, the jump action is called before the didEnd function. This is why I have the jumpCount set to 1 when the player contacts the platform. This works fine...
The real issue is when my player lands on the platform, and he bounces slightly off (due to restitution) and then the jump button is pressed.
When this occurs, the onGround flag is flipped to false before the jump action is called and my player can only single jump.
I'm trying to find a simple way to get around this issue without having to implement a bunch of code, haven't found a way yet.
So this is why I am here. I want to be able to double jump even with that slight little bounce I explained earlier.
Thank you in advance!!!
Additional Info:
I use the onGround flag so that if the player is on the ground, he can slide along the ground if they press the jump button in the right location...
Have you tried simply delaying setting the "on ground" flag by a fraction of a second?
let waitAction = SKAction.wait(forDuration: 0.5)
scene.runAction(waitAction, completion: {
self.onGround = false
})
Obviously you could experiment with the exact duration to make sure it gives the "bounce" just enough time to end.
I am trying to make a basic run and jump game in SpriteKit.
When the view loads I wish for the sprite node to Run using images from a texture atlas. This I have managed to do.
When the screen is touched I wish this image to change to another image in the texture atlas called Jump.
When the character returns to the ground I wish it to go back to the original texture atlas loop.
So far I have coded the following:
import UIKit
import SpriteKit
class Level1: SKScene {
var Hero : SKSpriteNode!
//Creates an object for the Hero character.
let textureAtlas = SKTextureAtlas(named:"RunImages.atlas")
//Specifies the image atlas used.
var spriteArray = Array<SKTexture>();
//Creates a variable for the image atlas of him running.
var HeroBaseLine = CGFloat (0)
//This is where the Hero character sits on top of the ground.
var onGround = true
//Creates a variable to specify if Hero is on the ground.
var velocityY = CGFloat (0)
//Creates a variable to hold a three decimal point specification for velocity in the Y axis.
let gravity = CGFloat (0.6)
//Creates a non variable setting for gravity in the scene.
let movingGround = SKSpriteNode (imageNamed: "Ground")
//Creates an object for the moving ground and assigns the Ground image to it.
var originalMovingGroundPositionX = CGFloat (0)
//Sets a variable for the original ground position before it starts to move.
var MaxGroundX = CGFloat (0)
//Sets a variable for the maximum
var groundSpeed = 4
//Sets the ground speed. This number is how many pixels it will move the ground to the left every frame.
override func didMoveToView(view: SKView) {
//Misc setup tasks.
backgroundColor = (UIColor.blackColor())
//Sets the background colour when the view loads.
//Ground related tasks.
self.movingGround.anchorPoint = CGPointMake(0, 0.5)
//Positions the Ground image hard left in the X axis.
self.movingGround.position = CGPointMake(CGRectGetMinX(self.frame), CGRectGetMinY(self.frame) + (self.movingGround.size.height / 2))
//Positions the Ground image at the bottom of the screen relative to half the height of the image.
self.addChild(self.movingGround)
//Creates an instance of the Ground image that follows the parameters set in the lines above when the view loads.
self.originalMovingGroundPositionX = self.movingGround.position.x
//Sets the starting position for the ground image in the x before it start to move.
self.MaxGroundX = self.movingGround.size.width - self.frame.size.width
//Sets the maximum ground size minus the width of the screen to create the loop point in the image.
self.MaxGroundX *= -1
//This multiplies the size of the ground by itself and makes the max ground size a negative number as the image is moving towards the left in x which is negative.
//Hero related tasks.
spriteArray.append(textureAtlas.textureNamed("Run1"));
spriteArray.append(textureAtlas.textureNamed("Run2"));
spriteArray.append(textureAtlas.textureNamed("Run3"));
spriteArray.append(textureAtlas.textureNamed("Run2"));
Hero = SKSpriteNode(texture:spriteArray[0]);
self.HeroBaseLine = self.movingGround.position.y + (self.movingGround.size.height / 2) + 25
//self.Hero.position = CGPointMake(CGRectGetMinX(self.frame) + 50, self.HeroBaseLine)
self.Hero.position = CGPointMake(CGRectGetMinX(self.frame) + 50, self.HeroBaseLine)
//Sets where the character will appear exactly.
self.Hero.xScale = 0.15
self.Hero.yScale = 0.15
addChild(self.Hero);
//Adds an instance of Hero to the screen.
let animateAction = SKAction.animateWithTextures(self.spriteArray, timePerFrame: 0.15);
let moveAction = SKAction.moveBy(CGVector(dx: 0,dy: 0), duration: 0.0);
//Although currently set to 0, the above line controls the displacement of the character in the x and y axis if required.
let group = SKAction.group([ animateAction,moveAction]);
let repeatAction = SKAction.repeatActionForever(group);
self.Hero.runAction(repeatAction);
//Animation action to make him run. Here we can affect the frames and x, y movement, etc.
}
override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
if self.onGround {
self.velocityY = -18
self.onGround = false
}
}
//This block specifies what happens when the screen is touched.
override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) {
if self.velocityY < -9.0 {
self.velocityY = -9.0
}
}
//This block prevents Hero from jumping whilst already jumping.
override func update(currentTime: CFTimeInterval) {
/* Called before each frame is rendered */
if self.movingGround.position.x <= MaxGroundX {
self.movingGround.position.x = self.originalMovingGroundPositionX
}
//This is how the ground is positioned at the beginning of each update (each frame refresh)
movingGround.position.x -= CGFloat (self.groundSpeed)
//This is how the ground is moved relative to the ground speed variable set at the top. The number in the variable is how many pixels the frame is being moved each frame refresh.
self.velocityY += self.gravity
self.Hero.position.y -= velocityY
if self.Hero.position.y < self.HeroBaseLine {
self.Hero.position.y = self.HeroBaseLine
velocityY = 0.0
self.onGround = true
}
//This is the code for making Hero jump in accordance to the velocity and gravity specified at the top of the class in relation to the base line.
}
}
I have tried to add code in the touchesBegan section to change the image texture of the sprite node to another image in my image atlas called Jump.
I then wish for the texture atlas to return to animating once the touches ended action is called.
Any help would be greatly appreciated.
Update:
I have implemented what you have suggested but it still doesn't work quite correclty. The hero is changing to the jumping image but does not actually jump and is stuck in the jump image.
I created a JumpImages.atlas and added "Jump" image to that folder.
I have modified the code to the following:
import UIKit
import SpriteKit
class Level1: SKScene {
//Creates an object for the Hero character.
var Hero : SKSpriteNode!
//Specifies the image atlas used.
let textureAtlas = SKTextureAtlas(named:"RunImages.atlas")
//Creates a variable for the image atlas of him running.
var spriteArray = Array<SKTexture>();
var jumpArray = Array<SKTexture>();
let jumpAtlas = SKTextureAtlas(named:"JumpImages.atlas")
//jumpArray.append(jumpAtlas.textureNamed("Jump")) Didn't work in this area, moved it to the did move to view.
//This is where the Hero character sits on top of the ground.
var HeroBaseLine = CGFloat (0)
//Creates a variable to specify if Hero is on the ground.
var onGround = true
//Creates a variable to hold a three decimal point specification for velocity in the Y axis.
var velocityY = CGFloat (0)
//Creates a non variable setting for gravity in the scene.
let gravity = CGFloat (0.6)
//Creates an object for the moving ground and assigns the Ground image to it.
let movingGround = SKSpriteNode (imageNamed: "Ground")
//Sets a variable for the original ground position before it starts to move.
var originalMovingGroundPositionX = CGFloat (0)
//Sets a variable for the maximum
var MaxGroundX = CGFloat (0)
//Sets the ground speed. This number is how many pixels it will move the ground to the left every frame.
var groundSpeed = 4
override func didMoveToView(view: SKView) {
//Misc setup tasks.
//Sets the background colour when the view loads.
backgroundColor = (UIColor.blackColor())
//Ground related tasks.
//Positions the Ground image hard left in the X axis.
self.movingGround.anchorPoint = CGPointMake(0, 0.5)
//Positions the Ground image at the bottom of the screen relative to half the height of the image.
self.movingGround.position = CGPointMake(CGRectGetMinX(self.frame), CGRectGetMinY(self.frame) + (self.movingGround.size.height / 2))
//Creates an instance of the Ground image that follows the parameters set in the lines above when the view loads.
self.addChild(self.movingGround)
//Sets the starting position for the ground image in the x before it start to move.
self.originalMovingGroundPositionX = self.movingGround.position.x
//Sets the maximum ground size minus the witdth of the screen to create the loop point in the image.
self.MaxGroundX = self.movingGround.size.width - self.frame.size.width
//This multiplies the size of the ground by itself and makes the max ground size a negative number as the image is moving towards the left in x which is negative.
self.MaxGroundX *= -1
//Hero related tasks.
spriteArray.append(textureAtlas.textureNamed("Run1"));
spriteArray.append(textureAtlas.textureNamed("Run2"));
spriteArray.append(textureAtlas.textureNamed("Run3"));
spriteArray.append(textureAtlas.textureNamed("Run2"));
Hero = SKSpriteNode(texture:spriteArray[0]);
self.HeroBaseLine = self.movingGround.position.y + (self.movingGround.size.height / 2) + 25
//Sets where the character will appear exactly.
self.Hero.position = CGPointMake(CGRectGetMinX(self.frame) + 50, self.HeroBaseLine)
//Scales the image to an appropriate size.
self.Hero.xScale = 0.15
self.Hero.yScale = 0.15
//Adds an instance of Hero to the screen.
addChild(self.Hero);
//Added this here as it didn't appear to work in the place recommended.
jumpArray.append(jumpAtlas.textureNamed("Jump"));
//I added this so that he runs when the view loads.
if self.onGround {
run()
}
}
//Animation function to make him run. Here we can affect the frames and x, y movement, etc.
func run() {
let animateAction = SKAction.animateWithTextures(self.spriteArray, timePerFrame: 0.15);
//Although currently set to 0, the above line controls the displacement of the character in the x and y axis if required.
let moveAction = SKAction.moveBy(CGVector(dx: 0,dy: 0), duration: 0.0);
let group = SKAction.group([animateAction,moveAction]);
let repeatAction = SKAction.repeatActionForever(group);
self.Hero.runAction(repeatAction);
}
//Animation function to make him jump.
func jump() {
self.velocityY = -18
self.onGround = false
let jumpAnimation = SKAction.animateWithTextures(jumpArray, timePerFrame: 0.15)
self.Hero.runAction(SKAction.repeatActionForever(jumpAnimation))
}
override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
//This block specifies what happens when the screen is touched.
if self.onGround {
jump()
}
}
override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) {
//This block prevents Hero from jumping whilst already jumping.
if self.velocityY < -9.0 {
self.velocityY = -9.0
}
}
override func update(currentTime: CFTimeInterval) {
/* Called before each frame is rendered */
//This is how the ground is positioned at the beginning of each update (each frame refresh)
if self.movingGround.position.x <= MaxGroundX {
self.movingGround.position.x = self.originalMovingGroundPositionX
}
//This is how the ground is moved relative to the ground speed variable set at the top. The number in the variable is how many pixels the frame is being moved each frame refresh.
movingGround.position.x -= CGFloat (self.groundSpeed)
//This is the code for making Hero jump in accordance to the velocity and gravity specified at the top of the class in realation to the base line and run when he hits the ground.
if self.Hero.position.y < self.HeroBaseLine {
self.Hero.position.y = self.HeroBaseLine
velocityY = 0.0
if self.onGround == false {
self.onGround = true
run()
}
}
}
}
Is there anything obvious I am doing wrong? Thanks for your help.
Since you have already made your sprite run, to jump is not a hard thing. Just replace the texture of run animation with the texture of jump animation in proper place.
Firstly, I wrap the code of run animation for reuse later.
func run() {
let animateAction = SKAction.animateWithTextures(self.spriteArray, timePerFrame: 0.15);
let moveAction = SKAction.moveBy(CGVector(dx: 0,dy: 0), duration: 0.0);
let group = SKAction.group([animateAction,moveAction]);
let repeatAction = SKAction.repeatActionForever(group);
self.Hero.runAction(repeatAction);
}
Next step is for texture atlas of Jump. For demo, I just add one frame animation for jumping. Add these line after you create textureAtlas and spriteArray for Run.
var jumpArray = Array<SKTexture>()
let jumpAtlas = SKTextureAtlas(named:"JumpImages.atlas")
jumpArray.append(jumpAtlas.textureNamed("Jump"))
After you write function jump(), you can call it in touchesBegan.
func jump() {
self.velocityY = -18
self.onGround = false
println("jump over ground")
let jumpAnimation = SKAction.animateWithTextures(jumpArray, timePerFrame: 0.15)
self.Hero.runAction(SKAction.repeatActionForever(jumpAnimation))
}
override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent?) {
if self.onGround {
jump()
}
}
Last but not least, resume running animation after back to the ground in update.
override func update(currentTime: CFTimeInterval) {
...
if self.Hero.position.y < self.HeroBaseLine {
self.Hero.position.y = self.HeroBaseLine
velocityY = 0.0
if self.onGround == false {
self.onGround = true
println("on the ground")
run()
}
}
}
Now you should get the result below. If you have any problem with the code, just let me know.
I'm trying to move SKSpriteNode horizontally by dragging. To get the idea of what I try to achieve you can watch this. I want player to be able to drag sprite without touching it. But I don't really know how to implement it correctly.
I tried to do something like:
override func didMoveToView(view: SKView) {
/* Setup your scene here */
capLeft.size = self.capLeft.size
self.capLeft.position = CGPointMake(CGRectGetMinX(self.frame) + self.capLeft.size.height * 2, CGRectGetMinY(self.frame) + self.capLeft.size.height * 1.5)
capLeft.zPosition = 1
self.addChild(capLeft)
let panLeftCap: UIPanGestureRecognizer = UIPanGestureRecognizer(target: capLeft, action: Selector("moveLeftCap:"))
And when I'm setting a moveLeftCap function, code that I've found for UIPanGestureRecognizer is requiring "View" and gives me an error. I also wanted to limit min and max positions of a sprite through which it shouldn't go.
Any ideas how to implement that?
You probably get that error because you can't just access the view from any node in the tree. You could to refer to it as scene!.view or you handle the gesture within you scene instead which is preferable if you want to keep things simple.
I gave it a try and came up with this basic scene:
import SpriteKit
class GameScene: SKScene {
var shape:SKNode!
override func didMoveToView(view: SKView) {
//creates the shape to be moved
shape = SKShapeNode(circleOfRadius: 30.0)
shape.position = CGPointMake(frame.midX, frame.midY)
addChild(shape)
//sets up gesture recognizer
let pan = UIPanGestureRecognizer(target: self, action: "panned:")
view.addGestureRecognizer(pan)
}
var previousTranslateX:CGFloat = 0.0
func panned (sender:UIPanGestureRecognizer) {
//retrieve pan movement along the x-axis of the view since the gesture began
let currentTranslateX = sender.translationInView(view!).x
//calculate translation since last measurement
let translateX = currentTranslateX - previousTranslateX
//move shape within frame boundaries
let newShapeX = shape.position.x + translateX
if newShapeX < frame.maxX && newShapeX > frame.minX {
shape.position = CGPointMake(shape.position.x + translateX, shape.position.y)
}
//(re-)set previous measurement
if sender.state == .Ended {
previousTranslateX = 0
} else {
previousTranslateX = currentTranslateX
}
}
}
when you move you finger across the screen, the circle gets moves along the x-axis accordingly.
if you want to move the sprite in both x and y directions, remember to invert the y-values from the view (up in view is down in scene).
I created this game using sprite kit. During the game sprite nodes are moving. When the "Game Over" Label pops up, I would like the monster sprite node to stop moving or pause, but the rest of the scene to still move on. I know where to put the code, I just don't know how to write it. This is my monster code.
func addMonster() {
// Create sprite
let monster = SKSpriteNode(imageNamed: "box")
monster.setScale(0.6)
monster.physicsBody = SKPhysicsBody(rectangleOfSize: monster.size)
monster.physicsBody?.dynamic = true
monster.physicsBody?.categoryBitMask = UInt32(monsterCategory)
monster.physicsBody?.contactTestBitMask = UInt32(laserCategory)
monster.physicsBody?.collisionBitMask = 0
monster.name = "box"
var random : CGFloat = CGFloat(arc4random_uniform(320))
monster.position = CGPointMake(random, self.frame.size.height + 20)
self.addChild(monster)
}
EDIT
override func update(currentTime: CFTimeInterval) {
if isStarted == true {
if currentTime - self.lastMonsterAdded > 1 {
self.lastMonsterAdded = currentTime + 3.0
self.addMonster()
}
self.moveObstacle()
} else {
}
self.moveBackground()
if isGameOver == true {
}
}
If I understand your question correctly, you want to pause a single (or small number of) nodes. In that case...
monster.paused = true
Is probably what you want.